Aqua Regia is a mixture of 1 part of Cone. HN03 with 3 parts of Cone. HCI.
It dissolves gold (Au) due to the liberation of nascent chlorine which forms gold chloride with it, which is soluble.
HN03 + 3 HCI —- > NOCI + 2H20 + 2CI
NOCI —> NO+CI
Au + 3CI —> AuCl3 gold chloude
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